In the mid of the 19th century, different theories arose to explain the cause of cholera. these theories were: i) the miasma theory; ii) the poison theory; iii) the contagion/germ theory. the miasma theory was strongly supported and advocated by john snow. a. true. b. false.

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the colonists were also expected to pay a tax to meet the costs of establishing and manning the borders of the proclamation line which led to the belief that the king had sided with the indians despite pontiac's rebellion, against the interests of the settlers. this contributed to the causes of the american revolution.

i think it's b